EP2089669A2 - Procédé et dispositif pour mesurer un corps - Google Patents

Procédé et dispositif pour mesurer un corps

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Publication number
EP2089669A2
EP2089669A2 EP07846306A EP07846306A EP2089669A2 EP 2089669 A2 EP2089669 A2 EP 2089669A2 EP 07846306 A EP07846306 A EP 07846306A EP 07846306 A EP07846306 A EP 07846306A EP 2089669 A2 EP2089669 A2 EP 2089669A2
Authority
EP
European Patent Office
Prior art keywords
light
light sources
detectors
light source
index
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07846306A
Other languages
German (de)
English (en)
Inventor
Gerd Laschinski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2089669A2 publication Critical patent/EP2089669A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D1/00—Foot or last measuring devices; Measuring devices for shoe parts
    • A43D1/02—Foot-measuring devices
    • A43D1/025—Foot-measuring devices comprising optical means, e.g. mirrors, photo-electric cells, for measuring or inspecting feet
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
    • A61B5/1074—Foot measuring devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting

Definitions

  • the invention relates to a method and a device for non-contact measurement of a length of a body, in particular of feet.
  • a caliper or the like used, which is slidably mounted on a tray.
  • To determine the shoe size or the sole length of the foot is placed on the tray and then brought the caliper to the foot.
  • the foot is usually placed with the heel in a fixed stop of the tray, so that it results in an exact reference point for a sufficient measurement accuracy.
  • On a scale the foot length and possibly also the foot width can then be read off. Since this method does not work without contact, the foot can be compressed during the measurement, which determines too small a foot length. Conversely, if the foot is not directly on the fixed stop, so too long foot length is determined.
  • Another disadvantage of such a measuring tray is that it requires a natural, upright state of the customer, so that a care by an operator is needed.
  • the movable caliper and / or a stop for the foot motor-driven so that an automatic measurement of the foot is possible.
  • the disadvantage here is that because of a low drive speed of the caliper or the stop this measurement is not very fast, and a pressing force is not tuned due to the motor drive on a custom foot. This can result in unwanted measurement errors.
  • the invention has for its object to provide a method and an apparatus, whereby a non-contact and rapid measurement of a body, in particular a foot with low error tolerance is possible.
  • the method according to the invention for the contactless measurement of a body comprises the steps:
  • step i) providing a plurality of light sources and light detectors, which light sources and light detectors in particular linearly and oppositely arranged and each connected to a control device, ii) placing the body between the light sources and light detectors, so that the body in the beam path between light sources and Iii) assigning a light detector to a light source to form a light source light detector pairing; iv) repeating step iii) for all remaining light detectors and light sources such that the beam paths of the respective pairings are parallel to each other, v) sequentially switching on the light sources from steps iii) and iv), and measuring the light intensity with the correspondingly assigned light detectors from step iii), wherein upon turning on a respective next light source the previous light source is turned off again, vi) determining the two light source light detector pairings at the boundaries of the body between which a light beam still passes, and vii) calculating the distance of the two Viii) determining the two light sources of the pairings from step vi), ix)
  • V offset N: natural number> 1 and assigning these light detectors (5- ⁇ ) to the corresponding light sources (4i) from step viii) to form a new light source-light detector pairing, x) switching on the respective light source (4- ⁇ ) from step viii) and measuring the light intensity with the corresponding light detector
  • step ix (5- ⁇ ) from step ix), xi) if light passes between a respective light source light-detector pairing from step ix): continue with step xii), otherwise continue with step xvi), xii) select a light source (4- ⁇ ) in a direction towards the
  • Offset (V) is shifted as in step ix), and assign this
  • Step xiii) light passes: go to step xii), else go to step xvi), xvi) select a respective light source in a direction away from the body (9) adjacent to the corresponding light source (4i) from step xii) , xvii) selecting a light detector (5- ⁇ ) whose index relative to the index of the light source (4-0 from step xvi) by the same
  • Offset (V) as in step ix) is shifted, and Assigning this light detector (5- ⁇ ) to the light source (4i) from step xvi) to form a new light source-light detector pairing, xviii) switching on the light source (4- ⁇ ) from step xvi) and measuring the light intensity with the light detector (5- ⁇ ) from step xvii), ixx) if light passes between the light source-light detector pairing from step xvii): continue with step xx), otherwise continue with step xvi xx) determining the two light source light detector pairings from step xviii) at the boundaries of the body (9), between which
  • L reg, 1 first modified length from step xxv) Si: distance between the light sources (4-0 or light detectors (5i) from step i), and xxvii) display the first actual length (L ta t , 1 ) instead of Distance from step vii).
  • the inventive method is particularly suitable for measuring feet of a human.
  • An important aspect with respect to a sufficiently high measurement accuracy is that the body has no angular edges.
  • the body should have rounded edges, or be formed round or oval with respect to the plane of the light sources and the light detectors.
  • the first modified length L reg, 1 defined in step xxv) is determined to be ao when the body is aligned with its longitudinal axis substantially parallel to the light sources or light detectors from step i).
  • the light sources can be switched on individually, wherein the incident on the light detectors light intensity for each detector can be measured individually.
  • the light sources are designed so that the light has a larger opening angle and meets at least several opposite light detectors.
  • several possible light source light detector pairings can be formed.
  • the control of the light sources and the reading of the light detectors and the processing of this data is from a suitable control device, a Microcontroller or the like, taken over.
  • the individual light sources and the individual light detectors are connected to the control device.
  • the method according to the invention is particularly suitable for non-contact measurement of a person's foot in order to determine a desired shoe size.
  • the body or foot is positioned between the light sources and the light detectors so as to be in the optical path between the light sources and the light detectors.
  • the length of the foot is first determined for the case in which a respective light source and a correspondingly assigned light detector are directly opposite each other.
  • the light source light detector pairings of step vi) between which a light beam still passes, are those in which the light beam is not blocked by the foot. Instead, in these light source light detector pairings, the respective light beam exits at the boundaries of the body, i. at a front and rear end of the foot, passing unhindered and falling on a respective light detector.
  • the length of the foot is overestimated, at most twice the distance between the light sources or the light detectors, minimally by zero.
  • the mean error is a simple distance between the light sources or the light detectors.
  • the length of the body or foot is overestimated on average by the distance of the light sources. By the distance of the light sources, the maximum error can be determined.
  • An advantage of the method according to the invention is that no moving parts are used which come into contact with the foot to be measured.
  • the light sources can be switched on and off very quickly if, in step v), the light sources are switched on sequentially one after the other so that several thousand light source light detector pairings per second can be measured. An entire foot can thus be measured several times per second, which increases the measurement accuracy.
  • This also means that the customer only has to put his foot between the light sources and the light detectors for a short time without standing still for a long time have to. If the foot stands still, then the error in the length determination remains the same. Since the measurement of the foot is fast, the foot must stop only for a short time. In just a short time, the foot can be measured from different sides, which further increases the measuring accuracy.
  • light-emitting diodes are expediently used as light sources, which are distinguished by low power consumption and a long service life.
  • the light intensity of the light-emitting diodes is adapted to one another by means of a control of the electrical current in order to exclude or reduce measurement errors.
  • an opening angle of the light sources or the light emitting diodes is such that the emitted light falls on more than one opposite light detector.
  • optionally different light source light detector pairings can be formed to reduce said foot overset or misalignment of the foot between the light sources and the light detectors.
  • the light sources are sequentially switched on by a respective edge of the row of light sources, so that an evaluation of the light source-light detector pairings, whose beam path is interrupted by the body, can be dispensed with.
  • the method further comprises a step aa), in which further light sources and light detectors are arranged, each arranged linearly in a row and opposite each other and each connected to a control device, said rows of light sources and light detectors preferably at right angles to the rows of light sources and light detectors from step i) are arranged.
  • the foot may not be aligned exactly parallel to the rows of light sources and light detectors of step i).
  • the foot may be skewed, wherein its longitudinal axis encloses an angle ⁇ with a longitudinal extent of the light sources or light detectors. From this misalignment of the foot can result in inaccurate, ie too large, readings. Therefore, the inventive method can identify a step bb), in which the steps iii) to vii) for the light sources and light detectors from step aa) are performed.
  • the light sources from step aa) can be created so that the light emitted by the light source falls on more than one opposite light detector.
  • a plurality of different light source light detector pairings can be formed.
  • the light sources or the light detectors from step aa) can have an equidistant distance from one another, which also reduces the computation outlay in the evaluation of the measurement results.
  • the method may further comprise the following steps:
  • step cc determining the two light sources from step aa) of the pairings according to step vi), if carried out in step bb), dd) starting from the two light sources from step cc): carrying out the steps ix) to xxi), ee) determining a positive index difference (L 2 ) of the light sources from step aa) of the respective light source light detector pairings from step xxi), ff) calculating a corrected length (L korri 2 ) for the individual index differences from step ee ),
  • Lreg, 2 biV + b 2 V 2 ... + b k V k + b 0
  • V respective offset from step ix), insofar as related to the light sources and light detectors
  • V 9 extremum offset from step kk)
  • B 2 distance between the rows of light sources and
  • V 1 tan ( ⁇ ) * B 1
  • V V 1 , oo) calculating the actual length (L tat , 1 ) of the body in step xxvi) with the modified length (L reg, 1) from step nn), and pp) displaying the actual length (L tat , 1 ) from step oo) instead of the length initially calculated in step xxvi), steps xxvii) and vii) being omitted.
  • steps cc) to pp) are based on the approach that by means of the measurement with the light sources and light detectors from step aa), a number of positive index differences L 2 and therefrom by angle correction generates a set of corrected lengths Lkorr, 2 for which a regression is performed.
  • a local extremum of the regression equation an extreme displacement V 9 between a respective light source and a correspondingly assigned light detector is computationally determined, in which the beam path between such light source light detector pairings best approximates a longitudinal axis of the body.
  • the adjusted offset Vi is then calculated, as defined in step nn), and then inserted into the equation for the modified length L re g, 1 defined in step xxv).
  • the modified length L re g, 1 thus calculated, the actual length L tat of the body is finally calculated as defined in step xxvi).
  • the method after step kk) instead of steps II) to pp) may comprise the following steps:
  • V (Vg) from step kk)
  • the regression defined in step xxiv) or gg) is a quadratic regression.
  • Such a quadratic regression ensures sufficient measurement accuracy with reasonable computational effort.
  • light sources in the form of light-emitting diodes in the infrared wavelength range can be used. Accordingly, photodiodes with a daylight filter can be used as light detectors that allows infrared light to pass. Thus, the measurement is largely independent of the ambient light.
  • a further elimination of the ambient light influence can be achieved by measuring the ambient light intensity on the light detectors with light sources switched off immediately before the steps v), x), xiv) or xviii) when the body is positioned between the light source / light detector pairings is positioned. Subsequently, the total intensity is measured on a respective light detector with the light source switched on. The difference between the total intensity and the ambient light intensity results in a light intensity caused by a respective light source, which is taken into account when measuring the light intensity in step v), x), xiv) or xviii). Thus, the incident on each light detector daylight is measured and deducted for the determination of the pairings according to step vi) and xxii).
  • a basic calibration of all light sources and light detectors is performed before the actual measurement of the body.
  • all the light sources from step i) or from step aa) are successively switched on and measured the light intensity for all possible combination of light detectors, which are opposite to these light sources.
  • the light intensity measured on the respective light detectors is stored in a memory unit and taken into account when determining the pairings from step vi) and xxii).
  • the light intensity on the light detectors is compared in step v), x), xiv) and xviii) with the previously measured light intensity according to the basic calibration. If a light intensity is significantly less than that of the base calibration, the body is located between the corresponding light source-light detector pairing.
  • the actual length calculated in step xxvi) corresponds to the foot length.
  • S2 here corresponds to the equidistant distance between the individual light detectors from step aa).
  • the light sources and the light detectors are mounted on opposite sides of a frame device, wherein the frame means at least partially formed of a frame profile and the light sources or the light detectors are received within the frame profile and the frame profile adjacent to the light sources and the light detectors each having an opening. wherein in the opening of the frame profile, a cover is enclosed, which is permeable to the frequency of the measuring light and serves as a daylight filter.
  • the device according to the invention is particularly suitable for contactless measuring of a person's feet.
  • the light sources and the light detectors may each be arranged linearly in a row, wherein these rows have the same distance from each other and are substantially parallel to each other.
  • the frame means which can enclose a bottom plate.
  • the light sources and light detectors are mounted on opposite sides of the frame means and are spaced from the bottom plate by the same distance. The body or the foot can be easily put on the bottom plate, where it is then positioned between the light sources and the light detectors.
  • both a length and a width of the body or the foot can be determined. Additionally and / or optionally, a misalignment of the body with respect to a longitudinal axis of the frame device can be computationally compensated in order to achieve a greater accuracy of measurement.
  • a cover can be enclosed in the opening of the frame profile, which closes the frame profile to the outside.
  • the cover can only be transparent to the frequency of the measuring light, and / or consist of a transparent pane.
  • the cover can also serve as a daylight filter.
  • the device may have a distance sensor which is attached to the frame means and is pivotable about at least one axis above the bottom plate.
  • a distance sensor which is attached to the frame means and is pivotable about at least one axis above the bottom plate.
  • the distance sensor can be pivotable about two axes above the bottom plate. This improves the measuring accuracy with respect to the height measurement of the body. Conveniently, the measurement by means of the altimeter on the principle of triangulation. Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.
  • Figure 1 is a perspective view of a device according to the invention
  • Figure 2 is a side cross-sectional view of the device along the
  • Figure 3 is a plan view of the device of Figure 1, when a
  • FIG. 3a is a schematic plan view of the device of FIG. 1, in which geometrical relationships for a correction of the length are explained, FIG.
  • FIG. 4 shows a table of the measurement of FIG. 3
  • FIG. 5 shows a diagram for the corrected length according to FIG. 4 as a function of the offset V
  • Figure 6 is a plan view of the device of Figure 1, when a
  • Measurement is performed with light sources and light detectors along a broad side of the frame device
  • FIG. 7 shows a table of measured values of the measurement of FIG. 6,
  • FIG. 8 shows a diagram of the corrected width according to the table of FIG.
  • FIG. 7 as a function of the offset V
  • Figure 9 is a plan view of a further embodiment of the device according to the invention, when a measurement with light sources and Light detectors is performed on opposite edge sides of the frame device,
  • FIG. 10 shows a table of measured values of the measurement of FIG. 9,
  • FIG. 11 shows a diagram of the corrected length according to the table of FIG. 10 as a function of the offset V, FIG.
  • Fig. 12 is a plan view of the apparatus of Fig. 9, wherein a measurement is made with light sources and light detectors on the other pair of edges of the frame means;
  • FIG. 13 shows a table of the measurement results for the measurements according to FIG. 12,
  • Figure 14 is a graph of the corrected width according to the table of Figure 13 as a function of the offset V.
  • Figure 15 is a perspective view of another embodiment of the device according to the invention, in which a distance sensor is provided for height measurement of the body.
  • FIGS. 1 to 8 illustrate a first embodiment of a device 1 according to the invention and the measuring principle on which it is based for measuring a body.
  • the device 1 comprises a rectangular bottom plate 2, on which a peripheral frame means 3 of four frame segments 3a to 3d is mounted.
  • the base plate 2 and the peripheral frame 3 are dimensioned so that a foot can be positioned within the frame means.
  • the frame means is sized sufficiently large for a foot when the longitudinal frame segments 3a and 3c are, for example, 40 cm long, and the wide frame segments 3b and 3d are 20 cm long.
  • any other size of the frame segments or the frame device is possible to measure larger bodies or objects than that of a human foot can.
  • the frame means may also have a shape deviating from a rectangle.
  • a plurality of light sources 4i which point in the direction of the opposite frame segment 3c and have an equidistant spacing from each other.
  • a plurality of light detectors 5i are mounted, which are aligned with the respective light sources 4i and also have an equidistant spacing from one another.
  • the light sources 4i and the light detectors 5i are each arranged at the same equidistant distance from each other. In this case, the distance between the light sources or the light detectors is determined by the desired measurement accuracy. In other words, the distance between the light sources or the light detectors determines the maximum or mean error without regression. Performing a regression will minimize this error. Since shoe sizes are usually graded at a distance of about 5 mm, offers for the equidistant distance between the light sources or light detectors on a distance of 5 mm. However, this distance can be changed or tuned to measure other bodies in any way.
  • light sources 4 2 and light detectors 5 2 are also arranged on the frame segments 3b, 3d.
  • the light sources 4 2 are also attached to the frame segment 3 b in an equidistant distance from one another.
  • All the light sources 4i, 4 2 and all the light detectors 5i, 5 2 are slightly spaced from the bottom plate 2, for example by 10 to 15 mm.
  • the light detectors may be formed as a strip element.
  • the distance of the light sources 4 1 f 4 2 and light detectors 5i, 5 2 of the bottom plate is chosen so large that they are just below the height of the toe or heel of a positioned on the bottom plate 2 human foot. Without further other distances of the light sources or the light detectors to Bottom plate possible when measuring bodies other than a human foot.
  • All light sources 4i, 4 2 and all light detectors 5i, 5 2 are connected to a control device or to a microcontroller or the like.
  • the microcontroller (not shown) controls switching on and off of the light sources and readout of the light intensity on the individual light detectors.
  • the light sources 4 ⁇ ⁇ attached to the frame segment 3a are removed from the light detectors 5i attached to the frame segment 3c by a distance Bi.
  • the light sources A 2 attached to the frame segment 3 b are spaced apart by a distance B 2 from the light detectors 5 2 attached to the frame segment 3d.
  • the device 1 is shown in a side cross-sectional view taken along the line AA of Figure 1.
  • the frame segments are formed in the form of a rectangular profile.
  • the frame segments 3a, 3c have on their respective inner wall surface an opening 6 which is formed in the longitudinal direction of the frame segments as a continuous slot.
  • a transparent plate 7 or the like is enclosed, so that the interior of the frame segments is closed to the outside.
  • the light sources 4i and the light detectors 5i are mounted within the frame segments via suitable holders 8 so as to be positioned adjacent to the opening 6 and the transparent disk 7, respectively. A light beam can thus strike a corresponding light detector 5i from a light source 4i through the two disks 7, if there is no body or measuring object in the beam path.
  • the frame segments 3b and 3d are formed analogously to the representation of Figure 2, wherein herein the light sources 4 2 and the light detectors 5 2 are mounted in the same way.
  • FIG. 2 further shows a measuring object 9 that is placed on the base plate 2. Without being limited to this, the measurement Object 9 below always referred to as foot. It can already be seen from the representation of FIG. 2 that the beam path is interrupted at least between some light sources 4i or 4 2 and some light detectors 5i or 5 2 when the foot 9 is placed on the base plate 2.
  • the device 1 is used for non-contact measurement of the foot 9 by means of the light sources 4 1 ( 4 2 or the light detectors 5i, 5 2.)
  • the measuring principle is explained in detail below.
  • the individual light detectors may optionally be assigned to a particular light source to form a light source light detector pairing.
  • a light detector 5i, 5 2 to a light source 4- ⁇ , 4 2 is not constant, but variable for different measurement runs.
  • the light sources 4i, 4 2 can be switched on sequentially by means of the microcontroller, so that the light intensity of a specific light source can be read out on the light detector of the corresponding light source light detector pairing. With a sufficiently large light intensity on the light detector, the beam path between this light source light detector pairing is not interrupted, or a light beam passes between this pairing. This is the case when the beam path is not blocked by the foot 9.
  • the individual light detectors have 5 ⁇ , 5 2 a particular light source 4 ⁇ 4 2 an optionally to form a light source-light detector pair.
  • these light source light detector pairings can be changed by assigning a different light detector to a particular light source.
  • the light sources with the index 1, 20, 2, 19, etc. are switched on sequentially one after the other.
  • these light sources are assigned light detectors with an even-numbered index.
  • a length of the foot 9 can be determined in a first approximation.
  • the length of the foot 9 is overestimated by the spacing of the light sources with the index 5 and 14.
  • the overestiming takes a maximum of twice the distance between the light sources or light detectors, minimally the value zero.
  • the mean error of the overestimation is a simple distance between the light sources 4i and the light detectors 5- ⁇ .
  • new light source light detector pairings are subsequently formed.
  • V +/- N shifted where N is a natural number> 1.
  • the second measurement run works as follows:
  • the light source with the index 5 is turned on. As can be seen in Figure 3, the light beam between this light source and photodetector pairing is not blocked by the foot 9, the distance between the beam path and the edge of the foot being less than the first measurement between the light source and the light detector, respectively Index is 5.
  • the light source with index 6 is turned on and checks whether the emitted light beam falls on the light detector with the index 7.
  • FIG. 3 shows that this is not the case since the foot 9 is located in the corresponding beam path. Thereafter, the measurement cycle jumps back to the light source with index 5 and its assigned light detector with index 6 and detects that the light beam still passes for this combination.
  • the method selects a light source in a direction away from the foot adjacent to the light source from the previous step.
  • this is the light source with index 13.
  • a light detector with the index 7 of the light source with the index 5 is assigned.
  • the light source with the index 5 is turned on and the light intensity is measured on the light detector with the index 7.
  • the light beam of this mating is blocked by the foot 9.
  • a light source is selected in a direction away from the body adjacent to the index 5 light source.
  • V the light detector with the index 16.
  • the method selects a light source in one direction away from the foot, that is the index 13 light source, with corresponding assignment of index 15 light detector.
  • the light between the pairing the light source with index 13 and the light detector with index 15 is not interrupted by the foot. Accordingly, for this measurement run, the two light source light detector pairings at the edges of the foot 9, between which a light beam still passes, are those with the light sources indexed 4 and 13 respectively.
  • a negative offset means that the index of a selected light detector is smaller than that of a corresponding light source. For example, with an offset of -3 of the light source with index 7, the light detector with index 4 is assigned. The same applies, for example, to the light source with index 15, which is assigned the index 12 light detector with an offset of -3.
  • each new light source light detector pairings with a different offset in each case now takes place in the same manner as explained above with respect to an offset of +1 or +2.
  • the pairings with the same offset between which at the edges of the foot still passes a light beam are indicated in Figure 3 by corresponding lines, as can be seen from the legend of Figure 3.
  • a positive index difference Li is then formed for the two light sources of all respective pairings.
  • L-reg, 1 a 2 * V 2 + ai * V + a 0 .
  • the value of 1 is subtracted from the regression parameter ao, and then multiplied by the distance Si between the respective light sources or light detectors attached to the frame segments 3a and 3c, respectively.
  • This result corresponds to the actual foot length with greater accuracy.
  • the subtraction of 1 from the regression parameter a 0 is performed because the mean error in over-estimating the foot is the simple distance between two light sources or light detectors.
  • the foot may be at an angle parallel to the frame segments 3a and 3c, respectively, with its longitudinal axis 10. This is also the case, for example, in the foot position according to FIG. 3, in which the longitudinal axis 10 of the foot 9 encloses an angle ⁇ with a straight line which is parallel to the frame segments 3 a and 3 c.
  • Such a "misalignment" of the foot will incorrectly determine its actual length as a result of an overestimation. With reference to FIGS. 6 to 8, it will be explained below how such misalignment is computationally compensated and thus a more accurate foot measurement is achieved.
  • the foot 9 is also measured by means of the light sources 42 and light detectors 5 2 , which are attached to the frame segments 3 b and 3 d, respectively.
  • the measurement by means of the light sources 4 2 and light detectors 5 2 is carried out analogously to the measurement according to FIG. 3 in a total of nine measurement runs, in which a different offset between the individual light sources 4 2 and the correspondingly assigned light detectors 5 2 is selected.
  • each light source 4 2 is assigned a light detector 5 2 with a correspondingly identical index.
  • those with the indexes 3 and 8 are determined as the light source-light detector pairings at the edges of the foot, between which a light beam still passes.
  • the light rays of the pairings with the index 4 to 7 are blocked by the foot 9.
  • the light sources 4 2 are switched on by the respective edges of the frame segment 3 b, it may be unnecessary to measure the pairings with the index 5 and 6, since blocking of the light beam by the foot 9 is already possible for the pairings with the index 4 or 7 is detected.
  • the pairings with the index 5 and 6 can be omitted. With an increased number of light sources or light detectors along the frame segments 3b and 3d, this leads to a reduced measuring time.
  • the offset between the light sources and the assigned light detectors is +1 to +4 and -1 to -4.
  • a positive index difference L 2 is then formed between the two light sources of the pairings, between which a light beam still passes. Since the measuring principle for selecting the respective light sources and selecting or assigning the corresponding light detectors completely analogous to the measurement takes place according to Figure 3, reference is made to avoid repetition.
  • the dashed lines represent the pairings as a function of a different offset between which a light beam still passes at the edges of the foot.
  • Offset V, V in each case selected offset between the light sources A 2 and the
  • Light detectors 5 2 , and B 2 distance between the light sources 4 2 and the light detectors 5 second
  • the corrected length L 2 is plotted as a function of the offset.
  • a regression is then carried out, in particular a quadratic regression. Based on the quadratic regression, a second modified length L reg, 2 is determined to:
  • the angle ⁇ can be determined by which the body with its longitudinal axis 10 is inclined with respect to a parallel to the frame segments 3a and 3c ". This angle ⁇ is equal to the angle ⁇ of FIG. 3.
  • an adjusted offset Vi is calculated with:
  • V 1 tan ( ⁇ ) * B 1
  • the thus calculated first actual length L tat , 1 now has a lower measurement error, since the misalignment of the foot 9 within the frame device 3 was at least partially excluded by means of the measurement with the light sources 4 2 and light detectors 52.
  • S2 is a respective distance between the light sources 4 2 and light detectors 5 2 .
  • the width of the foot can be displayed as the second actual length L tat, 2 by means of a display unit.
  • FIGS. 9 to 13 show a further embodiment of a device 1 according to the invention and the measuring principle on which it is based.
  • the frame means 3 and correspondingly also the base plate 2 are of square construction. Accordingly, the frame segments 3a to 3d are the same length, with the distances Bi and B 2 between the respective light sources and light detectors are equal.
  • the determination of a local extremum enables the calculation of a computational offset V 9 in which the beam paths of the two pairings at the edges of the foot best fit the longitudinal axis 10 of the foot 9. With this computational offset V 9 , the lowest overestimation of the foot width is thus present, as a result of which the misalignment of the foot 9 is detected. Because of the square shape of the frame device 3, the computationally determined extreme offset V 9 is equal to the adjusted offset Vi, so that the modified length L re9i 1 is newly determined
  • a distance sensor 12 is attached to the frame device 3 via a suitable holder 11.
  • a height of the foot 9 can be determined.
  • the measuring principle of the distance sensor is based, for example, on triangulation.
  • contactless measuring of the foot 9 is possible in a very short time and with sufficiently high accuracy.
  • a possible misalignment of the foot within the frame device can be compensated or calculated out, so that an overestimation of the foot length becomes minimal and the calculated length of the foot coincides approximately exactly with the actual foot length. It is understood that it is also possible to measure any other bodies or objects, and that the specified length dimensions for the frame device and the number for the light sources and light detectors are only to be understood as examples.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Biophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Molecular Biology (AREA)
  • Pathology (AREA)
  • Dentistry (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un procédé servant à mesurer un corps (9) et comprenant les étapes suivantes : fourniture d'une pluralité de sources lumineuses (4<SUB>1</SUB>) et de photodétecteurs (5<SUB>1</SUB>) qui sont notamment placés linéairement et à l'opposé les uns des autres et sont respectivement reliés à un dispositif de commande; positionnement du corps (9) entre les sources lumineuses (4<SUB>1</SUB>) et les photodétecteurs (5<SUB>1</SUB>) de sorte que le corps (9) se trouve dans la trajectoire de faisceau entre les sources lumineuses et les photodétecteurs; affectation d'un photodétecteur à une source lumineuse pour réaliser un appariement source lumineuse-photodétecteur; répétition de l'étape iii) pour tous les photodétecteurs et sources lumineuses restants de sorte que les trajectoires de faisceau des paires respectivement formées sont parallèles entre elles; allumage séquentiel des sources lumineuses des étapes iii) et iv) et mesure de l'intensité lumineuse au moyen des photodétecteurs respectivement affectés de l'étape iii), une source lumineuse précédente étant éteinte lorsque la source lumineuse respective suivante est allumée; détermination des deux paires source lumineuse-détecteur aux limites du corps, paires entre lesquelles passe encore un faisceau lumineux; calcul de la distance entre les deux sources lumineuses ou les deux photodétecteurs des paires source lumineuse-photodétecteur de l'étape vi).
EP07846306A 2006-11-08 2007-11-08 Procédé et dispositif pour mesurer un corps Withdrawn EP2089669A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610052921 DE102006052921A1 (de) 2006-11-08 2006-11-08 Verfahren und Vorrichtung zum Vermessen eines Körpers
PCT/DE2007/002021 WO2008055492A2 (fr) 2006-11-08 2007-11-08 Procédé et dispositif pour mesurer un corps

Publications (1)

Publication Number Publication Date
EP2089669A2 true EP2089669A2 (fr) 2009-08-19

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ID=39311118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07846306A Withdrawn EP2089669A2 (fr) 2006-11-08 2007-11-08 Procédé et dispositif pour mesurer un corps

Country Status (3)

Country Link
EP (1) EP2089669A2 (fr)
DE (1) DE102006052921A1 (fr)
WO (1) WO2008055492A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL188645A (en) * 2008-01-07 2011-12-29 Eliaho Gerby Foot measuring device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004074769A2 (fr) * 2003-02-24 2004-09-02 Cedes Ag Procede pour mesurer un objet sans contact

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7900596A (nl) * 1979-01-25 1980-07-29 Stichting Voet En Schoeisel Voetmeetapparaat.
GB2141226A (en) * 1983-05-27 1984-12-12 Clarks Ltd Optical measurement of human feet
DE3535270A1 (de) * 1985-10-03 1987-04-09 Fischbach Joern Uwe Prof Dr Vorrichtung und verfahren zur messung des umfangs und des volumens oedembehafteter extremitaeten
US5790256A (en) * 1992-06-23 1998-08-04 Footmark, Inc. Foot analyzer
DE4304388B4 (de) * 1993-02-13 2005-11-03 Fischbach, Jörn Uwe, Prof. Dr. Vorrichtung und Verfahren zum Ermitteln von Umfangsmaßen länglicher Körper

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004074769A2 (fr) * 2003-02-24 2004-09-02 Cedes Ag Procede pour mesurer un objet sans contact

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Publication number Publication date
WO2008055492A3 (fr) 2008-11-06
DE102006052921A1 (de) 2008-05-21
WO2008055492A2 (fr) 2008-05-15

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